Turns out it's not the resolution of the monitors - that was set correctly.
It's just that the Windows 7 taskbar on the main screen clip region somehow also through the load screen window, even though it's not actually drawn. It just masks it.
I moved the taskbar to the second monitor and now the entire load graphic is shown.
I run my monitors at 1360x768, and I've noticed that the load/pause/exit images all wind up with about 20 pixels or so clipped off the left side. Is this unique to my machine?
It otherwise works extremely well, so hats-off to all involved.